Sorry, no online dictionaries contain the exact phrase upper spectrum.
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Reverse dictionary results:
1. italicize
2. filtered
3. level
4. doublet
5. filter
6. filtering
7. line
8. red
9. fog
10. part
11. fogged
12. band
13. blue
14. blue shift
15. continuous spectrum
16. degrade
17. frequency
18. gamma radiation
19. many
20. multiplet
21. overall
22. range
23. red shift
24. ruby
25. uhf
26. ultraviolet
27. violet
28. above
29. adaxial
30. altitude
31. aristocracy
32. bak
33. bandwidth
34. belt
35. bend
36. bended
37. bends
38. bens
39. bound
40. brace

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You can look up the words in the phrase individually using these links:   upper ?   spectrum ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
uppe*to search for words beginning with uppe, or
*trumto search for words ending with trum
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